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  Redis分布式锁
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  <p id="hitokoto">正在加载一言...</p>

<h2 id="Redis分布式锁"><a href="#Redis分布式锁" class="headerlink" title="Redis分布式锁"></a>Redis分布式锁</h2><h3 id="1、常见分布式锁实现原理"><a href="#1、常见分布式锁实现原理" class="headerlink" title="1、常见分布式锁实现原理"></a>1、常见分布式锁实现原理</h3><ul>
<li><p>setnx key value</p>
<blockquote>
<p>通过setnx命令，当且仅当key不存在时，将key的值设置为value；当key已经存在时，不执行set操作</p>
<p>SETNX是【SET If Not Exists】(如果不存在，则set)的简写；</p>
<p>返回值：</p>
<p>1 设置key成功<br>0 设置key失败</p>
<p>使用：</p>
<p>使用setnx，加锁成功后，通过expire给锁增加过期时间，使用完解锁</p>
<p>优点：简单，在并发不高的场景下，可以使用</p>
<p>缺点：加锁和设置过期时间非原子操作，可能出现加锁之后，程序异常，没有设置过期时间，导致程序阻塞</p>
</blockquote>
</li>
<li><p>SET实现的分布式锁</p>
<blockquote>
<p>语法：</p>
<p>SET key value [EX seconds|PX milliseconds] [NX|XX]</p>
<p>将键<code>key</code>设定为指定的“字符串”值。如果 <code>key</code> 已经保存了一个值，那么这个操作会直接覆盖原来的值，并且忽略原始类型。当<code>set</code>命令执行成功之后，之前设置的过期时间都将失效。</p>
<p>使用：通过命令加锁，加锁的同时会设置过期时间，用完之后进行解锁</p>
<p>优点：加锁和设置过期时间是原子操作，不会出现程序一直阻塞的问题</p>
<p>缺点：过期时间内，线程A加锁的业务还没有执行完，可能其它线程 线程B会获取锁，然后之前的线程A执行完进行解锁，导致线程B的锁被释放了</p>
</blockquote>
</li>
</ul>
<h3 id="2、Redisson实现的分布式锁"><a href="#2、Redisson实现的分布式锁" class="headerlink" title="2、Redisson实现的分布式锁"></a>2、Redisson实现的分布式锁</h3><p>示例：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Bean</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> Redisson <span class="title">redisson</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="comment">// 此为单机模式</span></span><br><span class="line">        Config config = <span class="keyword">new</span> Config();</span><br><span class="line">        config.useSingleServer().setAddress(<span class="string">&quot;redis://localhost:6379&quot;</span>).setDatabase(<span class="number">0</span>);</span><br><span class="line">        <span class="keyword">return</span> (Redisson) Redisson.create(config);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">//获取锁对象</span></span><br><span class="line">        RLock redissonLock = redisson.getLock(lockKey);</span><br><span class="line">        <span class="comment">//加分布式锁</span></span><br><span class="line">        redissonLock.lock();  <span class="comment">//  .setIfAbsent(lockKey, clientId, 30, TimeUnit.SECONDS);</span></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">int</span> stock = Integer.parseInt(stringRedisTemplate.opsForValue().get(<span class="string">&quot;stock&quot;</span>)); <span class="comment">// jedis.get(&quot;stock&quot;)</span></span><br><span class="line">            <span class="keyword">if</span> (stock &gt; <span class="number">0</span>) &#123;</span><br><span class="line">                <span class="keyword">int</span> realStock = stock - <span class="number">1</span>;</span><br><span class="line">                stringRedisTemplate.opsForValue().set(<span class="string">&quot;stock&quot;</span>, realStock + <span class="string">&quot;&quot;</span>); <span class="comment">// jedis.set(key,value)</span></span><br><span class="line">                System.out.println(<span class="string">&quot;扣减成功，剩余库存:&quot;</span> + realStock);</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                System.out.println(<span class="string">&quot;扣减失败，库存不足&quot;</span>);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            <span class="comment">//解锁</span></span><br><span class="line">            redissonLock.unlock();</span><br><span class="line">        &#125;</span><br></pre></td></tr></table></figure>

<p>底层逻辑：</p>
<ul>
<li>锁续命</li>
<li>锁重入</li>
</ul>
<p><img src="/2022/06/02/03-00-07-Redis%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81/Redisson%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81%E5%8E%9F%E7%90%86.png" alt="Redisson分布式锁原理"></p>
<p>加锁逻辑：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//加分布式锁</span></span><br><span class="line">redissonLock.lock();</span><br><span class="line">------&gt;加锁</span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">lock</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            lockInterruptibly();<span class="comment">/**【0】*/</span></span><br><span class="line">        &#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">            Thread.currentThread().interrupt();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;    </span><br><span class="line">------&gt;加锁【<span class="number">0</span>】</span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">lockInterruptibly</span><span class="params">()</span> <span class="keyword">throws</span> InterruptedException </span>&#123;</span><br><span class="line">        lockInterruptibly(-<span class="number">1</span>, <span class="keyword">null</span>);<span class="comment">/**【1】*/</span></span><br><span class="line">    &#125;</span><br><span class="line">------&gt;加锁【<span class="number">1</span>】</span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">lockInterruptibly</span><span class="params">(<span class="keyword">long</span> leaseTime, TimeUnit unit)</span> <span class="keyword">throws</span> InterruptedException </span>&#123;</span><br><span class="line">        <span class="keyword">long</span> threadId = Thread.currentThread().getId(); <span class="comment">// 线程id</span></span><br><span class="line">        Long ttl = tryAcquire(leaseTime, unit, threadId);<span class="comment">/**【2】*/</span></span><br><span class="line">        <span class="comment">// lock acquired</span></span><br><span class="line">        <span class="keyword">if</span> (ttl == <span class="keyword">null</span>) &#123;  <span class="comment">// 加锁成功</span></span><br><span class="line">            <span class="keyword">return</span>;</span><br><span class="line">        &#125;</span><br><span class="line">		<span class="comment">// redis的发布/订阅  抢锁失败 订阅channel 【redisson_lock__channel】</span></span><br><span class="line">        RFuture&lt;RedissonLockEntry&gt; future = subscribe(threadId);</span><br><span class="line">        commandExecutor.syncSubscription(future);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">while</span> (<span class="keyword">true</span>) &#123; <span class="comment">// 没加锁成功 自旋  非公平锁实现</span></span><br><span class="line">                ttl = tryAcquire(leaseTime, unit, threadId); <span class="comment">// 又尝试加一次锁</span></span><br><span class="line">                <span class="comment">// lock acquired</span></span><br><span class="line">                <span class="keyword">if</span> (ttl == <span class="keyword">null</span>) &#123; <span class="comment">// 加锁成功 跳出循环</span></span><br><span class="line">                    <span class="keyword">break</span>;</span><br><span class="line">                &#125;</span><br><span class="line"></span><br><span class="line">                <span class="comment">// waiting for message</span></span><br><span class="line">                <span class="keyword">if</span> (ttl &gt;= <span class="number">0</span>) &#123;</span><br><span class="line">                    getEntry(threadId).getLatch().tryAcquire(ttl, TimeUnit.MILLISECONDS); <span class="comment">// 调用Semaphore信号量 许可数量为0 获取许可逻辑 获取不到 阻塞ttl s  阻塞等待 让出cpu  不会占用cpu   -----&gt;唤醒 见  【7】</span></span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    getEntry(threadId).getLatch().acquire();</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">finally</span> &#123;</span><br><span class="line">            unsubscribe(future, threadId);</span><br><span class="line">        &#125;</span><br><span class="line"><span class="comment">//        get(lockAsync(leaseTime, unit));</span></span><br><span class="line">    &#125;</span><br><span class="line">------&gt;加锁【<span class="number">2</span>】</span><br><span class="line"><span class="function"><span class="keyword">private</span> Long <span class="title">tryAcquire</span><span class="params">(<span class="keyword">long</span> leaseTime, TimeUnit unit, <span class="keyword">long</span> threadId)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> get(tryAcquireAsync(leaseTime, unit, threadId)<span class="comment">/**【3】*/</span>);</span><br><span class="line">    &#125;</span><br><span class="line">------&gt;加锁【<span class="number">3</span>】</span><br><span class="line"><span class="keyword">private</span> &lt;T&gt; <span class="function">RFuture&lt;Long&gt; <span class="title">tryAcquireAsync</span><span class="params">(<span class="keyword">long</span> leaseTime, TimeUnit unit, <span class="keyword">final</span> <span class="keyword">long</span> threadId)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (leaseTime != -<span class="number">1</span>) &#123; <span class="comment">// 默认-1 会走下面逻辑</span></span><br><span class="line">            <span class="keyword">return</span> tryLockInnerAsync(leaseTime, unit, threadId, RedisCommands.EVAL_LONG);</span><br><span class="line">        &#125;</span><br><span class="line">        RFuture&lt;Long&gt; ttlRemainingFuture = tryLockInnerAsync(commandExecutor.getConnectionManager().getCfg().getLockWatchdogTimeout(), TimeUnit.MILLISECONDS, threadId, RedisCommands.EVAL_LONG);<span class="comment">/**【4】*/</span></span><br><span class="line">        ttlRemainingFuture.addListener(<span class="keyword">new</span> FutureListener&lt;Long&gt;() &#123;</span><br><span class="line">            <span class="meta">@Override</span></span><br><span class="line">            <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">operationComplete</span><span class="params">(Future&lt;Long&gt; future)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">                <span class="keyword">if</span> (!future.isSuccess()) &#123;</span><br><span class="line">                    <span class="keyword">return</span>;</span><br><span class="line">                &#125;</span><br><span class="line"></span><br><span class="line">                Long ttlRemaining = future.getNow();</span><br><span class="line">                <span class="comment">// lock acquired</span></span><br><span class="line">                <span class="keyword">if</span> (ttlRemaining == <span class="keyword">null</span>) &#123;  <span class="comment">// 加锁成功</span></span><br><span class="line">                    scheduleExpirationRenewal(threadId);  <span class="comment">/**【5】*/</span></span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;);</span><br><span class="line">        <span class="keyword">return</span> ttlRemainingFuture;</span><br><span class="line">    &#125;</span><br><span class="line">------&gt;加锁【<span class="number">4</span>】</span><br><span class="line">&lt;T&gt; <span class="function">RFuture&lt;T&gt; <span class="title">tryLockInnerAsync</span><span class="params">(<span class="keyword">long</span> leaseTime, TimeUnit unit, <span class="keyword">long</span> threadId, RedisStrictCommand&lt;T&gt; command)</span> </span>&#123;</span><br><span class="line">        internalLockLeaseTime = unit.toMillis(leaseTime);</span><br><span class="line">		<span class="comment">// 通过lua脚本加锁</span></span><br><span class="line">        <span class="keyword">return</span> commandExecutor.evalWriteAsync(getName(), LongCodec.INSTANCE, command,</span><br><span class="line">                  <span class="string">&quot;if (redis.call(&#x27;exists&#x27;, KEYS[1]) == 0) then &quot;</span> +   <span class="comment">// key不存在 往hash中添加数据 同时设置过期时间</span></span><br><span class="line">                      <span class="string">&quot;redis.call(&#x27;hset&#x27;, KEYS[1], ARGV[2], 1); &quot;</span> +</span><br><span class="line">                      <span class="string">&quot;redis.call(&#x27;pexpire&#x27;, KEYS[1], ARGV[1]); &quot;</span> +</span><br><span class="line">                      <span class="string">&quot;return nil; &quot;</span> +		<span class="comment">// 加锁成功 ，返回null</span></span><br><span class="line">                  <span class="string">&quot;end; &quot;</span> +</span><br><span class="line">                  <span class="string">&quot;if (redis.call(&#x27;hexists&#x27;, KEYS[1], ARGV[2]) == 1) then &quot;</span> + <span class="comment">// key 和filed存在 value值自增 重新设置过期时间【锁重入逻辑】</span></span><br><span class="line">                      <span class="string">&quot;redis.call(&#x27;hincrby&#x27;, KEYS[1], ARGV[2], 1); &quot;</span> +</span><br><span class="line">                      <span class="string">&quot;redis.call(&#x27;pexpire&#x27;, KEYS[1], ARGV[1]); &quot;</span> +</span><br><span class="line">                      <span class="string">&quot;return nil; &quot;</span> +</span><br><span class="line">                  <span class="string">&quot;end; &quot;</span> +</span><br><span class="line">                  <span class="string">&quot;return redis.call(&#x27;pttl&#x27;, KEYS[1]);&quot;</span>, <span class="comment">// 没有加锁成功 返回这个key剩余的过期时间</span></span><br><span class="line">                    Collections.&lt;Object&gt;singletonList(getName()<span class="comment">/**redis key getLock()方法传入*/</span>), internalLockLeaseTime<span class="comment">/**过期时间，默认30s*/</span>, getLockName(threadId)<span class="comment">/**设置一个值	*/</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">------&gt;加锁【<span class="number">5</span>】</span><br><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">scheduleExpirationRenewal</span><span class="params">(<span class="keyword">final</span> <span class="keyword">long</span> threadId)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (expirationRenewalMap.containsKey(getEntryName())) &#123;</span><br><span class="line">            <span class="keyword">return</span>;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        Timeout task = commandExecutor.getConnectionManager().newTimeout(<span class="keyword">new</span> TimerTask() &#123;</span><br><span class="line">            <span class="meta">@Override</span></span><br><span class="line">            <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">(Timeout timeout)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">                </span><br><span class="line">                RFuture&lt;Boolean&gt; future = commandExecutor.evalWriteAsync(getName(), LongCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN,</span><br><span class="line">                        <span class="string">&quot;if (redis.call(&#x27;hexists&#x27;, KEYS[1], ARGV[2]) == 1) then &quot;</span> +  <span class="comment">// 判断hash的key 对应的field是否存在[存在表明没有执行完]，存在则设置key过期</span></span><br><span class="line">                            <span class="string">&quot;redis.call(&#x27;pexpire&#x27;, KEYS[1], ARGV[1]); &quot;</span> +</span><br><span class="line">                            <span class="string">&quot;return 1; &quot;</span> +</span><br><span class="line">                        <span class="string">&quot;end; &quot;</span> +</span><br><span class="line">                        <span class="string">&quot;return 0;&quot;</span>,</span><br><span class="line">                          Collections.&lt;Object&gt;singletonList(getName()), internalLockLeaseTime, getLockName(threadId));</span><br><span class="line">                </span><br><span class="line">                future.addListener(<span class="keyword">new</span> FutureListener&lt;Boolean&gt;() &#123; <span class="comment">// 延时任务 延时执行</span></span><br><span class="line">                    <span class="meta">@Override</span></span><br><span class="line">                    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">operationComplete</span><span class="params">(Future&lt;Boolean&gt; future)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">                        expirationRenewalMap.remove(getEntryName());</span><br><span class="line">                        <span class="keyword">if</span> (!future.isSuccess()) &#123;</span><br><span class="line">                            log.error(<span class="string">&quot;Can&#x27;t update lock &quot;</span> + getName() + <span class="string">&quot; expiration&quot;</span>, future.cause());</span><br><span class="line">                            <span class="keyword">return</span>;</span><br><span class="line">                        &#125;</span><br><span class="line">                        </span><br><span class="line">                        <span class="keyword">if</span> (future.getNow()) &#123;</span><br><span class="line">                            <span class="comment">// reschedule itself</span></span><br><span class="line">                            scheduleExpirationRenewal(threadId);  <span class="comment">// 此处自我调用 达到了类似定时任务执行的效果 值得借鉴 好处是时间间隔可控，这里是续命逻辑，通过类似定时任务逻辑达到续命的目的</span></span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;, internalLockLeaseTime / <span class="number">3</span> 【值为<span class="number">10</span>】, TimeUnit.MILLISECONDS);</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (expirationRenewalMap.putIfAbsent(getEntryName(), task) != <span class="keyword">null</span>) &#123;</span><br><span class="line">            task.cancel();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>解锁逻辑：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br></pre></td><td class="code"><pre><span class="line"> <span class="comment">//解锁</span></span><br><span class="line">redissonLock.unlock();</span><br><span class="line">-----&gt;【<span class="number">0</span>】</span><br><span class="line">   <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">unlock</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        Boolean opStatus = get(unlockInnerAsync(Thread.currentThread().getId())<span class="comment">/**【1】*/</span>);</span><br><span class="line">        <span class="keyword">if</span> (opStatus == <span class="keyword">null</span>) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalMonitorStateException(<span class="string">&quot;attempt to unlock lock, not locked by current thread by node id: &quot;</span></span><br><span class="line">                    + id + <span class="string">&quot; thread-id: &quot;</span> + Thread.currentThread().getId());</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> (opStatus) &#123;</span><br><span class="line">            cancelExpirationRenewal();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//        Future&lt;Void&gt; future = unlockAsync();</span></span><br><span class="line"><span class="comment">//        future.awaitUninterruptibly();</span></span><br><span class="line"><span class="comment">//        if (future.isSuccess()) &#123;</span></span><br><span class="line"><span class="comment">//            return;</span></span><br><span class="line"><span class="comment">//        &#125;</span></span><br><span class="line"><span class="comment">//        if (future.cause() instanceof IllegalMonitorStateException) &#123;</span></span><br><span class="line"><span class="comment">//            throw (IllegalMonitorStateException)future.cause();</span></span><br><span class="line"><span class="comment">//        &#125;</span></span><br><span class="line"><span class="comment">//        throw commandExecutor.convertException(future);</span></span><br><span class="line">    &#125;</span><br><span class="line">-----&gt;【<span class="number">1</span>】</span><br><span class="line"><span class="function"><span class="keyword">protected</span> RFuture&lt;Boolean&gt; <span class="title">unlockInnerAsync</span><span class="params">(<span class="keyword">long</span> threadId)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> commandExecutor.evalWriteAsync(getName(), LongCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN,</span><br><span class="line">                <span class="string">&quot;if (redis.call(&#x27;exists&#x27;, KEYS[1]) == 0) then &quot;</span> +  <span class="comment">// key不存在，已经解锁了</span></span><br><span class="line">                    <span class="string">&quot;redis.call(&#x27;publish&#x27;, KEYS[2], ARGV[1]); &quot;</span> +  <span class="comment">// 发布消息，通知解锁，【解锁消息】</span></span><br><span class="line">                    <span class="string">&quot;return 1; &quot;</span> +</span><br><span class="line">                <span class="string">&quot;end;&quot;</span> +</span><br><span class="line">                <span class="string">&quot;if (redis.call(&#x27;hexists&#x27;, KEYS[1], ARGV[3]) == 0) then &quot;</span> + <span class="comment">// 这个锁是不是当前线程加的 不是 返回nil</span></span><br><span class="line">                    <span class="string">&quot;return nil;&quot;</span> +</span><br><span class="line">                <span class="string">&quot;end; &quot;</span> +</span><br><span class="line">                <span class="string">&quot;local counter = redis.call(&#x27;hincrby&#x27;, KEYS[1], ARGV[3], -1); &quot;</span> +  <span class="comment">// 是当前线程  这个是重入逻辑，重入次数减1</span></span><br><span class="line">                <span class="string">&quot;if (counter &gt; 0) then &quot;</span> +					<span class="comment">// 重入续命</span></span><br><span class="line">                    <span class="string">&quot;redis.call(&#x27;pexpire&#x27;, KEYS[1], ARGV[2]); &quot;</span> +</span><br><span class="line">                    <span class="string">&quot;return 0; &quot;</span> +</span><br><span class="line">                <span class="string">&quot;else &quot;</span> +							<span class="comment">// counter为0 删除key，发布消息</span></span><br><span class="line">                    <span class="string">&quot;redis.call(&#x27;del&#x27;, KEYS[1]); &quot;</span> +</span><br><span class="line">                    <span class="string">&quot;redis.call(&#x27;publish&#x27;, KEYS[2], ARGV[1]); &quot;</span> +</span><br><span class="line">                    <span class="string">&quot;return 1; &quot;</span>+</span><br><span class="line">                <span class="string">&quot;end; &quot;</span> +</span><br><span class="line">                <span class="string">&quot;return nil;&quot;</span>,</span><br><span class="line">                Arrays.&lt;Object&gt;asList(getName(), getChannelName()), LockPubSub.unlockMessage, internalLockLeaseTime, getLockName(threadId));</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">-----&gt;订阅监听【<span class="number">7</span>】</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">LockPubSub</span> <span class="keyword">extends</span> <span class="title">PublishSubscribe</span>&lt;<span class="title">RedissonLockEntry</span>&gt; </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> Long unlockMessage = <span class="number">0L</span>;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">protected</span> RedissonLockEntry <span class="title">createEntry</span><span class="params">(RPromise&lt;RedissonLockEntry&gt; newPromise)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">new</span> RedissonLockEntry(newPromise);</span><br><span class="line">    &#125;</span><br><span class="line">	<span class="comment">// 订阅的消息 消费逻辑</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">onMessage</span><span class="params">(RedissonLockEntry value, Long message)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (message.equals(unlockMessage)) &#123;</span><br><span class="line">            value.getLatch().release();  <span class="comment">// 信号量解锁唤醒</span></span><br><span class="line"></span><br><span class="line">            <span class="keyword">while</span> (<span class="keyword">true</span>) &#123;</span><br><span class="line">                Runnable runnableToExecute = <span class="keyword">null</span>;</span><br><span class="line">                <span class="keyword">synchronized</span> (value) &#123;</span><br><span class="line">                    Runnable runnable = value.getListeners().poll();</span><br><span class="line">                    <span class="keyword">if</span> (runnable != <span class="keyword">null</span>) &#123;</span><br><span class="line">                        <span class="keyword">if</span> (value.getLatch().tryAcquire()) &#123;</span><br><span class="line">                            runnableToExecute = runnable;</span><br><span class="line">                        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                            value.addListener(runnable);</span><br><span class="line">                        &#125;</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">                </span><br><span class="line">                <span class="keyword">if</span> (runnableToExecute != <span class="keyword">null</span>) &#123;</span><br><span class="line">                    runnableToExecute.run();</span><br><span class="line">                &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                    <span class="keyword">return</span>;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

 
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